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Reports nested classes that are declared without any access modifier (also known as package-private).
<p><b>Example:</b></p>
<pre><code>
  public class Outer {
    static class Nested {}  // warning
    class Inner {}          // warning
    enum Mode {}            // warning depends on the setting
    interface I {}          // warning depends on the setting
  }
</code></pre>
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<p>Configure the inspection:</p>
<ul>
  <li>Use the <b>Ignore package-visible inner enums</b> option to ignore package-private inner enums.</li>
  <li>Use the <b>Ignore package-visible inner interfaces</b> option to ignore package-private inner interfaces.</li>
</ul>
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